Geoff Mortimer was formerly Lecturer in German at St Edmund Hall, University of Oxford, UK, where he also studied history. His publications include Eyewitness Accounts of the Thirty Years War 1618-48 (2002), Early Modern Military History, 1450-1815 (2004), and Wallenstein: The Enigma of the Thirty Years War (2010), together with a number of academic articles on this period.